A 700lb or 900lb gorilla would be equally entitled to sleep wherever he wants to. Interestingly, the Wikipedia entry for Gorilla states that the average male gorilla weighs about 400lb, occasionally reaching 500lb in the wild. Only obese gorillas in captivity have attained weights of 600lb. So the number doesn't even seem to be related to gorilla biology (except that it is safely larger than any known gorilla, save King Kong).
Aid rentierism in Afghanistan has been a good contributor to economic growth and GDP per capita. Afghanistan managed to maintain an average of 12.4% growth rate between 2002 and 2013, while per capita income has increased over five-fold between 2002 and 2013.
What is the 'Income Effect'. The income effect represents the change in an individual's or economy's income and shows how that change impacts the quantity demanded of a good or service. The relationship between income and quantity demanded is a positive one; as income increases, so does the quantity of goods and services demanded.